Ceiling electric-light fixture



Feb. 25, 1930. w KNAPP I 1,748,352

CEILING ELECTRIC LIGHT FIXTURE Filed March 14, 1929 m INVENTOR W1 BY T Patented Feb. 25,. 1 9310 PATENT OFFICE WILLIA KNAPP, oF'HoLLIs, new YORK,

CEILING ELECTRIC-LIGHT rix runn Application filed March 14,1929. Serial No. 's4esea' This invention relates to improvements in electric fixtures and more particularly to that typ'e'of electric fixture adapted to fasten directlyagainst a ceiling.

One'object of the invention is to produce a fixture of the nature referred to of a simple and rigid construction. g Another object'of the invention is to. provide a cooling and ventilating system in a fixture of this character that will prevent the L deterioration of the insulation of the current carrying wires in the ceiling, due to the heat 1 generated by the lamps in such fixtures, and

" thus minimize the fire hazard. I

A further object of the invention is to pro- Vide a fixtureof this nature that will prevent any dust or dirt from the ceiling from fallinginto the globe orbowl attached thereto.

Another object is to produce a device of the character described 'in'which-the maxidjmum simplicity of construction and operation' is secured.

Other objects and advantages will appear as the nature of the improvements is better understood, the inventionconsisting substantiallyinthe'novel arrangement and co-relation of parts herein fully described, and illustrated in the accompanying drawings, whereinfsimilar reference characters are usedto de-v scribe corresponding parts throughout the several views, and then finally pointed outand specifically defined and: indicated in the ap- Pendedclaims. I

. The disclosure made the basis of exemplitying the presentinventive conceptsuggests e a practicaliembodiment thereof, but the'infvention is notto be restricted to-the exact details of this disclosure,fand the latter, therefore, isto be understood from an illustrative,

: rather than a restrictive standpoint.

The inventive idea involved is capable of receiving a variety of mechanical expressions, one of which, for the purpose of illustration, is'shown in the accompanying drawings, in "which .7 I

Figure l is a side View partly in section of iny'improved electric :fiXture secured in place againsta ceiling.

' Figure 2is a topplan viewof the fixture and Figure 3 is a bottomjplan view thereof.

, fixture will fall into the bowl.

Theelectric ceiling fixtures now commonly used consist of a shell open at the top and bot- .tom thereof in which a plurality of electric lights are supportedand enclosed, by a, bowl or globe. These lights when lit generate a 5'5 great'amount of heat, which due to-the conistruction of the fixtures has no means of escape and rises into the ceiling drying out the rubber covering or insulation of the current carrying wires in the said ceiling, causing the said insulation to crumble and fall off the wires; Shouldthe wires cross at any'point where the insulation has fallen off a short circuit and often a fire will ensue. Likewise due to the fact that the fixture is open at the top a great deal of dust and dirt from the ceiling, which is also open directly above the said It is to eliminate these disadvantages and defects that I have perfected my present in- I vention. I I

" Referring now to the drawingsi-n detail;5 indicates the bodyportion of my improved fixture which is'preferably made or spun of thin sheet metal, and consists of an upper cylindrical portion 6 and a lower reduced portion '7. A metal bracing or'reinforcing disk or plate 8 at the bottom of the portion6 separates and completely closes off the lower portion 7 from the upper portion 6. The said so disk 8 is supported on an annular flange 9 and fits into a head 10 onthe portion6, the said beadbeing spun when the disk is in position on the flange. A short distance above the disk 8 there is provided a second disk 12 $5 made of any suitable heat and fire repelling material, such as for instance asbestos or the like. The said asbestos" disk is supported between projections 13 and 1 1 punched out and bent inwardly from the outer circumferentialwall 15 of the upper portion 6. Openings16and 17, the objects of which will pres- 'ently be described, are formedby the punching and bending operation above mentioned.

The fixture is supported on a pipe 20 in the ceiling 21 and held against same by means of a hickey '22 threaded at one end to the said pipe20 and at its opposite end to a short nipple 23 :which passes through the disks 8.

and 12 and is provided at the lower end c 26 are secured to the lower side of the disk 8 and are adapted to receive electric light bulbs thereof with a lock nut 24. Sockets 2 5 and 27 and 28. Lead wires 29 and 30 extend from the sockets 25 and 26 and pass through openings 31 and 32 in the asbestos disk 12 into and through a ceiling box 33 and are spliced or otherwise securedto the main current carrying wires 34' and 35 in the ceiling. These wires 34: and 35 are usually provided With .a

rubber insulation 36. A globe or bowl 37 1 closes the fixture at the bottom thereof. 7 Any heat generated by the lamps 27fand 28 when they are lit will be unable to pass into the ceiling through the asbestos disk 12 to aifect the insulation ofthe wires 34; and 35, but the said heat will passout through the openings 16. Cool air will also be permitted to pass into the fixtures through the said.

openings 16yas well as through the openings 17 thus providing a combined cooling and 7 ventilating system; I have found in actual rations.

practice "that this cooling and ventilating system is so effective, that it provides a lower temperature at the immediate vicinity of the lamps than at other parts of the ceiling.

From the foregoing it will be seen that I have providedan electric ceiling fixture having a cooling and ventilating system therein to prevent the insulation of the main current carrying wires, from becoming deteriorated and peelingofE-the said wires, and to-prevent the resultant short circuits and fires.

Having described my I invention what I claim. as new and desire. to. secure by Letters Patent is 5 v 1. In an electric light ceiling fixture, a

shell havingan upper and lowerrow of perforations in the outer wall thereof, a" heat in sulating closure located between the said rows of perforations, and an electric light support below'the heatinsulating closure and perfo- 2. In an electric light ceiling 'fixture,c.a

shell having an upper and lower row of perforations in the outer wall thereof, inwardly extending projections extending from the bottom of the upper row of projections and the top of the other row of projections, a heat insulating closure supported between the said projections and an electric light supporting member below the lower row of perforations.

3. In an electric light ceiling vfixture, a

body, an electric light supporting member therein, a heat insulating closure in the body above the light supporting member and a cooling and ventilating system comprising openings in the body above and below the closure.

.In testimony whereof I hereunto aflix my signature. 7

WILLIAM KNAPP. 

